class Person:
    name = "leo"


class Student(Person):
    def __init__(self, school_name):
        self.school_name = school_name


if __name__ == '__main__':
    user = Student("常青藤大学")
    print(user.__dict__)
    print("======")
    user.__dict__["school_add"] = "广东省佛山市"
    print(user.school_add)